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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c3db325982d6885bacf9de6f96a287e09f0fe63c27e56210aefaa1ba9c721b' 
  AND token = 'QZlpTuMpK5+gJuIvw+Xd1vyMj2VIABQcfmaMAfWG11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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