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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57f7b7b59da62096c4ada3b314a4a3fb914561cd9427f7cc87601eb7cbdc35a' 
  AND token = 'he2Jbcxf8PCaYGHpY7HOrw2pvvNp5CXU/j304YMw+aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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