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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1898fa84d60b839b55b90c7036c413d928339af9ca73097f7e5cc491e3fb5659' 
  AND token = 'bMXlke2mzTMNU9ayFHfeY60EZV6saNvIFuw5tMhmmvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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