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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f00663295f705114ef4e9770b74426a6ac022a514cd42b5759808e999abf096' 
  AND token = 'uZncvVUNA7iekaQO/sr56Rk7J4wZzu5b8UEL4Q/xxYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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