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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd50e7b460a192b3995fac8bd7bb31e29f5f87e67353dbed3224020b065d5a806' 
  AND token = 'bMDzRkbtXK2jBoURV0pwuKVqKcSzeuDtNw8adOQs0OE=' 
  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"
    }
  }
}