SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a54004dcb437c34b44c348c58e232c10313fe2851f2e87d80bff385af9fe9b7' 
  AND token = 'YFZ4BBipP8P/llFCgWb0Li7vjmfI6+W3qlGDSv5iPJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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