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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58c3aaa21fc747df374ffb6ce446315ea8f42af2a0df566539dcaf3efed9b5b' 
  AND token = 'CTB5hxkN+Tp9lpA3ZXeL0a6c876bIyGrbqr8jZcrZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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