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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd918525e07502d98868f350c6ec99d5adef98e05212f37610faf45304d896d8d' 
  AND token = 'ms2xIEWKvafsUo1FyPfW8tcnLn00UZkn4NI94K7GYOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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