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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b889cecea1582e01e5a11403ba53508fd3bfdbfc5fc73c3e275c9aadc4019119' 
  AND token = 'lR6raFbcNZ6vK5RPq3QvhJGZiIfmZeLGSrLp3oL6R2Y=' 
  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"
    }
  }
}