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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '71ec6a725d1e9a647a928557d841ddcf18b3bf62ed7b518c3798accdf55746d3' 
  AND token = 'aloWGG9eJfmsoOrdlmSRAyRu79C5CD7xVtPnxMsdX3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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