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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830a15c56915d67720280fe15c8d9d578db0a52d8f05feb5ddba1a208883448e' 
  AND token = '6xyvmMNLMxBdPTKZk4RV969RX493sl69QgbGbV0tUB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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