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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b089735c1dd70ddda60c18c23c04b14587ecb25d12bba1680483b74aa1159aa8' 
  AND token = 'EwHijz/nWEbdzZMKe4AKT+bYe66aTiHcOzNVIyY4LaM=' 
  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"
    }
  }
}