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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f26661543ef4dfcbe787f56fc86f9457cd832bd2939d1f66f3f4ce5f807f53d' 
  AND token = 'USYZ0KgwjPXI6hVYNYc0Wwyy0560FhJ3OHJx4+1bthI=' 
  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"
    }
  }
}