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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5ec68fb224211171e6a1fefcf5b443740a5997beb0b485094d8992054ab099' 
  AND token = 'beIByKGmey2q0w6vAb6b1emjovE1CqixbjA2NBbGnu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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