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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7a7686c02159b68564436f79d0e404be42f6b80ef44759bbd2ae0746d5870036' 
  AND token = 'gjsD7M5mHuAKFRQmb+RRaaA3A2XWBavwIW4nJzcaWQI=' 
  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"
    }
  }
}