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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2847a6d739f4cda58268cb47816804db0fa1f48f98e2fab61aa18e89597938b2' 
  AND token = '3KnVeA9cEH0e4o721Dky4+PPg7DddntxzQdb/quoFNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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