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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c61237c1d4f7be1958cbcd5e29aa241419b5552b327d6886d2aaa18935adef76' 
  AND token = 'pO1MlYly1oAIiLn+H0foOll6/u/I+5gAbRZU+AA53jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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