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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b5b329d3b0809990e34e76afb04418e8514e7ccdd9e700dd681733fd5a340e' 
  AND token = 'r5mQbHa7QT0K8f5qW0WO1rViW/5FTR29lOd0ItH+PFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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