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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'de4562f97ab468a3c397b4c41540df28aa3c9540315cfb5f6ffd326db2bb5d1e' 
  AND token = 'pCz9EH0uLj6PWG6TD4CEGZsFkRnoVGHocCeGndzuZ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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