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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0670eadad9ed5b4d9e19d851ed659f49ac9c1bb1fa9306fb1ed7c6d48763d417' 
  AND token = 'S3g1SwqZrle8ZPEz4AXz+UARuiY9GbvGo785DLdEQHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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