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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ec82725e3b844499b05e6e052a03fd3531d7ece10bc2b257f5c556fdc8a271' 
  AND token = '4EPgT+FXBCwB6y9St7KHp6huUXaygxt/1yH4UVEzB3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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