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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073546d5c64927211ee82f0e5799eb3b2f7d30af638faf5ebca5332b881eaf3b' 
  AND token = '1qEtZZoPfkVFRHOatO9GNHZf5Uiojhceuta7kL/J03c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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