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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dd2d9b6ce3c80040b8a651a79a7c8139dd5e433016cb0229cfb145889f6685' 
  AND token = '1XORUsMJH4YdrK9N0od9W3gXfnl8hvLM9aFxbayntdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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