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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9ad6ef9d2de8650f0920392273e849895d4b227a2e12467bba29309e6d7208f7' 
  AND token = 'dxXxxP5l9SDKbg1nkQJwhqMtgYuVi3lpM6cPQX0qzpQ=' 
  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"
    }
  }
}