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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'bcb8c84ff81dcbc13dcdea391581843d7f1914939d0502db4cb0c77b12aea718' 
  AND token = 'P71NStgQfYTeWp4Ky3e9C88wAWNZ5n8HAet6IGcRkOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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