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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261ff412bd6fd6ef23d7fc91c3d890a836aed46f469150d8dfdd41bf91408b54' 
  AND token = 'HCokg83t20d1BrUcTHLwPYxIc7bfSOac0tG1NKjHw24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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