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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cde398fe9e5139f1189a5daaa7712f1811ad4a352153de229b38d83cfe7027' 
  AND token = 'mVKRJmjQ9mj541cvogWDirBFJ8xDvzy8lGyV+CB12+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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