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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd75a5496ca2239466a27cd14af6bb0499832d4c9abfdf9f759bd101a819b1d' 
  AND token = '9g7d2IFCnuVCUl/w7dBRx0W2L4ktCtXg3ubGzs52AGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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