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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd7f6426f28c46bab2d87101e0fb8c698212f5fff076fa307ec2b508fa8ebf0fb' 
  AND token = '+CmwTMukCmgDj4EfxNPxdPvXpIeHVfWjpY7jUYXWWAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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