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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6d4c071ad3d4ef474e0e8afc9dfe5b74c6061d59784565a783c48b4928d21c' 
  AND token = 'KaoOj0XfcY+MMS9FZ0OLtYzFMbvmR919zpCPGR9MkGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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