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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd269d03adb5d2cc8ea819437d1ffdd2835bc2c56df45bcb48f3ff6d2347d0ddf' 
  AND token = 'cFFeDe1nFHHxlNEDyN8opUAcZISPzHtiw3UXl3g5QDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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