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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '54cdceb36a6c45a338f35fd679c4364e0c6f0aab00597f7c4e972adada4dd986' 
  AND token = 'w8PEJiPqdym4WX4wsAb6rlUTbxzCfrIbzyv2golh1w0=' 
  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"
    }
  }
}