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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c007b19ab37d2a6f52a230a479627f87108348f69b64335e4526e93f111c45' 
  AND token = 'btOGhh+NqIqvngX1u7unrcS772+4VUOYd+8AU5mR20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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