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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80fcf5f1cf928cef6f653e06b9e2964005214e76d57a49c290021dcb1dcf09d' 
  AND token = 'P7mfBpG9Wt0zK/HK+th4EAiqW5EiStZZQg/WrIsEu6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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