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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bb2101659538e00c1f454567a175579d3b2c92a47e83a325947cdcc6488688' 
  AND token = 'fYw+SFYG8+Jf7SGeUkRLhW7pYg98m7orahyXh8UAXtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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