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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4a7a9d8766ca25495240bb4a0ea534a059afc45f06caa229d5ec93f4690b77' 
  AND token = 'EQh5EbWUCR8MHPa41IQf8O80nWkTaLJY5uQYP0A58fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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