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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fb106632342398966a2e778e65572cc976afffe4c3bf1069e15a7aab7d6a21fb' 
  AND token = 'dCbVynmaduirpEjq7vT93ZFMysqg/26gBmdEkdp17zM=' 
  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"
    }
  }
}