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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e832766c92b9e433cd36341709cd0c69b4153c76e0c0bfb0ab3f7db0c6a014' 
  AND token = 'oIUMj8/4l1ggSRHio7o8exn5xjMV27gbFRhQR2FMWUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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