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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd067faa97bac5c85ab4a36b01452be211077a5945f0e4fa3507e072a192a7796' 
  AND token = 'WXd/A3xsS/uC1m1mIARpzm97XhPghjWGQbLs7WrolNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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