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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '49186ca74e29941b4c9523d79a4d21d13d5b4eca5fed0951de28dd9d1de89289' 
  AND token = 'wjyL7+gu10vvdC0jFaD/KCtOc2sAK+7SgD50/67Xh4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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