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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e486ec1486d53be0d376f79999a530f44f370d1dab046e68df9cb29a6d70c76a' 
  AND token = 'kXKSDEdh0f2mMkH8Nmt13ou/e1f7DplENPaKaR3+hJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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