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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb63cd77fda9a771384c3abe78b8153d82c3c5d233e08133534c8a897a207aa' 
  AND token = 'rt3Ct3CVGYW1+Qf9M8/ATFf2YOK7RoUdY6P9aFj/4NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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