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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97857410fff44d650ff0c10dde2aef669b448962eea190c59049b8ebff247208' 
  AND token = 'BkfBSyj3QNXQ3pjr18W9rt/JUcnQ6zcvDGe3Mv67Sws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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