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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cfe819735e3166c1cd26034db3d245062f17b39392cc12ec33367a4c6550a4' 
  AND token = 'VnD29K493o7nKMisQq/ZOOrtG3E21WinXGXawM3uTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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