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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '257e7cf341d41855780adaf1174c4408e6e8f423dcf6cdfad63fe13e61f8747b' 
  AND token = '/gDfWFB8Ba/916TNFDFKfVuR2eETfQpULSsmxS3pvG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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