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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6eb34d04e8755df8f764243d4d478799be03b11cb5d6dfaea7307b4e9f7ae56' 
  AND token = 'TJSQ4tFagoUp0i12f2KjkARV/Wm6vpWsw8n8PeeWMTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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