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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3cb30271c025ccf25fce8137f665eebfb43b515d261f26be4e7b7981bce4cc' 
  AND token = 'GJ7Pxm92uXczBy9rOkV3H2rSBS80mEXeqgKqSeeGWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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