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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a75686ab40a43298ab97b1880118aaa141966e58b0c0230c3fbedea86e9395' 
  AND token = '9oq4zlBSsq4W59gk81mvHWlhJc/LQ/ExO0d6reUQmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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