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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a35ede3bdc8dbba6379ab34cdcf87bb66bc8394967f344f6d407267ea38c643' 
  AND token = 'kQQ9gyBSvb/SILQgw1F5YS56alfrSGnvQYhne/FR628=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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