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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a0604490ed8a77e6aab08fc2e8de6f46ffc537b2154ea90ae24bfccbca33f' 
  AND token = 'RwLQdgPY4F8gJ8bOAGCc6GcC/4KrWeC4axSY0D5wFME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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