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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '59c676fec73f92a6713eb8d6f25888920da6f227b348ef500ac0b7d51908f255' 
  AND token = 'du/eDmNsUa1lB0DPSXsPFm372+2iHFvBKjVrNPiFqiA=' 
  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"
    }
  }
}