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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e5a4f0e09aade8984e79f7c0fcaf41905bddf10efccc03be938f2c7a5a25bf' 
  AND token = 'PhCe7l06tdE+rLs+KWgbJ189FgZjbTKHv3bi+uv1Ytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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