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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a50a896d8e733993d26614cead3b545ebbd413bb79e17652604ca43dbf4cc57d' 
  AND token = 'aZb5JjPqDD6GvoVtjNJXcGnB+Jtrw1c+TvOL3HDQe60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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