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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c81292214bad7194130ca98a5cba092d2d0769383c9f44013e45d6412b697c' 
  AND token = '0kT7KT/coFtN5QjVnQQJN9E01bc/Mq1k75Ewn/1FXFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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