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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2cc8a7b336880be0535b342f14e84395152343295b4cf75b22c3fd238ba5b86a' 
  AND token = 'n4D+lyqmJFXVLLog5Hw0sfF48CNk8czN1mrRhtrKoTI=' 
  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"
    }
  }
}