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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfabee83edfd0b1697a4aeee44725bddd05c6fc97301945f2ef9d51dd19ec23' 
  AND token = 'BLK/3xvqoKgF0R7UMbpr5sucV3zcW7eGSGFNBOEG45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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