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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0283ce6c40ed02f8d354d7fb6d50414485c58f9a4eb5c7cf6bafa1ddf73e839f' 
  AND token = 'WtdUX1rXoPiAz2IrKtn/w564W22CehDV9vp8n9o12x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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