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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641a6b8525bc52f6c453653dc13b72c96161adf5368e4f6e864b051107f4fcd5' 
  AND token = '9/9RX4SeLdjm7URLJ1gslf6Z0qDJ5y0GLfpsnfbc58E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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