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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '18fede4ecdc737129032a87dce081cd19266f46e8fe0136a31feb64185f42be1' 
  AND token = '92v8vTl6TElAYHwatwUYPtprZAvy172vU2iGzw0jOpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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