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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3341192d81495b15faa4fb919eaf4f381ec22a8d1f1bb6000d096aaf1c7362d4' 
  AND token = 'dNmb7jpCuFJP2yHiYa4yB6P5HgrOEeOV3ixqdYe7ylI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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