SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a08950aeb75fe8784509478421dabf82e2630044403bc58695627154e4ec15a' 
  AND token = 'jk7JusYStx1wGHZK+TYDhvN2PObXpzRpMLHIJbKuv6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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