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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d14cc2bb0b5e45d4f0b0d966700d9ff7de7ca2268d2d55d9889c1cab133af64' 
  AND token = '9z4jH9FHDuQMaYkHXwDZ9m2jZ9+gLCO0C/szgOlg9f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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