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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e650e5fbc2c9aead5cd317d66cfa1a1bb98ed77de0fc68c9dc82b895ca11f367' 
  AND token = '9A8lwqvVaQT+5oGgQjU6jPK+Hs6ybPEG0n028GJQRpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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