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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7793dbc18d13f75ce3df724ba6e4f5bc0cae1f424a181de1d2945aa78ae7205d' 
  AND token = 'hi5iaZdAb3Tn64uzGH5+73D25jhQI/hkzE7TFToz7mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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