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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ec8c8d4f988ca8483eb234bbc88d2cecf8e1cbf0d755cbb8eee1c23e9efaf1' 
  AND token = 'IxRcRxCpA8CyYd6KkQaRkj7E/zwOyCChjFov9Mtvmes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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