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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eeb69eafc647de78a26785ccfb32e2c15ad4aacac76b5a7729dfb7307a1f5f' 
  AND token = 'WMhS/bdA5ekCqubyECVAvA8eYGfVuMGw9q9MSWKgjTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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