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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336e5673cba5ba267fcec917e26098a85e01b634cff54b57723fe89ac8fbde37' 
  AND token = 'xcOZY+fxg8SKjUfINgH9V/XqX6Irpe2+0BfCUhHScyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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