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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9585eb2072e61c1cf6d7b39632fda17bb132061d2496f8ba348bd8c0412b29f2' 
  AND token = '7EW7N9Ygu8IrBj0HX3AvRAMQcqcx6146G8W+5i8FD+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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