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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f99587969d950eb3b4d470d3850b7d4ed703c0897d4fdf8a63e7bb14bda2d3d' 
  AND token = 'lXIFkSSK3vZfjlgR3N24oWOUgMmqnt1A+IxsW6XsDNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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