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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1517b07cdb237f7de5cd88e6a6cbd204c9931abb23e661d732f0b08553294b05' 
  AND token = 'x/yT6rqAfBNXZf6O5X2OUTQannEydFQMSBrXw1iOY78=' 
  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"
    }
  }
}