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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d6ae5b33abd12c570b87c1d83f89fa92dbf9f6ea78fbb45b4bea9a43a249d7' 
  AND token = 'c1MRbuc4v6ybomPp6dV2a163UTV207E9HgRptaogJqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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