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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a351b3a1b3ccf729bb44724c698b3a061d5539ffacc9b61d706fd167adff07d3' 
  AND token = 'AGO3OlereSTfMD3YxB0PwQat+KRk7FigVs+QSo9KLIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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