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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71e9897dec75e9ef02992b5fee02b091c1616357aa3103ab285b79cc4b8b7c2' 
  AND token = 'vcsJjS9s5THdpu5c4gUFaUjK1amqv1BWse4DBtxMLlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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