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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d44c373d6d9d7adf5a295fe259aff148ec125bb29865b6688e47372fbe20f73' 
  AND token = 'IABeHIS0aS1Df81/N63b8eIulRrfQR6rid1qBsUCF0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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