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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '76bb4248e8bb0a23b7eedbe68bb3f91871ede38dce9281638eed6ce6c5429ea1' 
  AND token = '4E2rJ9sJF32D0WhKOF5/z9FPXUXzsK2/XMTwPZvFBaM=' 
  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"
    }
  }
}