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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '42bc1362709a2b4841fc1fcb711ae1bbdadf124c907a0a49ed0917828eef263c' 
  AND token = '5Ywm41mclt4BcL+b58fpJbe+NA/mEP5OZgFxQ4O009g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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