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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3e44b2587f1e41ffc473b8e68a1cc3c5ff02f36260b88ce1cdebdc81922210' 
  AND token = '/PZJxxPUyELerSUMWMTw6yS1+PU6dN6E9oQdrteS3tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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