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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a664a28babb257d16d22b6806f5afb4bdfd814cf1af02f735cb5dfec4c3f77a8' 
  AND token = 'hXNida3wHtvvro2GK+F60fje7nXeEj9R1TvZ4X0QlzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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