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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ddd11d7fe8ff08196dba732a8f93d026e26f4d95285762a89b5b1ff28ddd58' 
  AND token = 'enP40rS2TAYdH4rklqeJ7aKxVy8GKlD/EvUAYcKIj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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