Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdc7ef023b50012355dfe5826c909c93fbc6610609d2429efcb8af9bbee5ed6' 
  AND token = 'bqfbraKxlOs2Q2FzLMHshZ5MTD+C4fmCox+FH2AP3Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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