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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d1b62fc95c103ec746b0762f4e0baafa0b5b22e94d3d8a4beb2dcdfec62f0a' 
  AND token = 'uFFQkcOvVsTn9dQ7tn/s/lU4md8BsLhZmoByxF42iqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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