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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7f324c055c3d20009686186627a2d6e59f21e7a9743ea40c9590a4282f671a' 
  AND token = 'JaddUabhH+P6UjVIbBslddN9P38VXwTidXO9IKY8SE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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