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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4cedba9f35cb1789a467bf731418abcba19cea2bdc87523baf037033e04bcb' 
  AND token = 'WN9IivSHYGowr3gLdgV93h7Q4OuBhGe5LyOl3/WGeNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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