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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9766396330196bc21dbf63d46124d838ae32fae2d4250b720db99a867225f023' 
  AND token = '6Gbu8xlnD6944U8YVzxHl5IjjVdwDj6j7Zq4fC+27mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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