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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63f9ae6fa651164bd68e708a74e0846700a587ea7e902fd49f053cd9d5a4b97' 
  AND token = 'bZUE+dmleTm5OCj5yKt/IPuxbF4l0MObsqFNAXvjDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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