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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc06a5b0cc2551697e960c21e992d6cf88488949ddc2020178a03608d3f181a' 
  AND token = '4c5iDY0ODyp6xAIx8NiUC7jw6hAC7PRMV0+5ldVTi3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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