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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f727b439278156d72529df21ef3f32e449c33aa93e38643e69eba0267829ee81' 
  AND token = '9NeC6ECpGo/ub/rt7sspZC4NwaEBffkfxLUMJ9qSrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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