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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af09c7d049c1d0be3c4553fcecfb235372efabc25cc9a54b40afc313ebba84f' 
  AND token = 'u2YI0tLoQ/Y76GAc3wjG9dNMvlvYfb+WaDnVguG067s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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