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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b26a5463307ad605eb505eee36e8c04a3f5784efd53b08bd5dc4a3e77ea3da' 
  AND token = 'krrUt+DiF6eWuF97/31sLickXh6EAeHuCL/Nes4QpLM=' 
  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"
    }
  }
}