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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4d7826bff6ab09363013d52cd2cf8bbaf21293d8bab7261e2edc06b9aacae7a8' 
  AND token = 'ZPgcMe8s8OGj+YbRAoWVAgRHJLAJ9EtbxUNEOCW4oMc=' 
  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"
    }
  }
}