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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89bd94b164f7d7a103f232f249fa1498d8fd5f1d32f6d59b853931ff050f564d' 
  AND token = 'gcQmma/LRr13Jk3HRE6BZk20ewgCnV4JFATwQIRonao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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