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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabec884758eb059d661e903304542265d5d27604c2172a1173b69b682b78495' 
  AND token = '2sVGr5n1fiUkQqqKhSthmys7T3sjFgOy1o5nLAN/BG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}