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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01c3b1e00ce97cf09b17cf85e4b6d6fd724feb5e74ba2088ba1ac0f37b81dd5' 
  AND token = '0fAHXKRh/Zidnkr476HJXlNXBO2lo/8dEt8Evi7dKW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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