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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa568e996293e5d099ee3aaf8f11b4cde4f59c005775e5488db2d6989eb1dc3d' 
  AND token = 'Xxx6+bcE0Hd7CaEXq5QVkaAfOZGXEnY1eo4UMPIlTk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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