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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '38b8e1e470a1e48d69efc8c011a268171e0b07d1f150faacbca65506fdd53cc3' 
  AND token = 'J/9mK/N9gmM+b8H52UZTBxVNTkqUuJFcU0YoZmlN9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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